Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Thevenin voltage

Required number input.

Thevenin resistance

Required number input.

Compute the maximum power in watts deliverable to a matched load from a Thevenin equivalent source. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Maximum power

The resulting maximum power returned as a number.

• Compact electronics formulas omit some combination of tolerances, temperature drift, bandwidth, loading, parasitics, noise spectrum, nonlinearity, clipping, calibration, layout, and device-specific limits. Typical datasheet values are not guaranteed limits.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Max Power Load

  Find the load resistance in ohms that absorbs maximum power from a source, equal to the source resistance by the maximum power transfer theorem.

• Holdup Time

  Compute the holdup time of a bulk capacitor from the energy delivered between the input and minimum voltages at a constant load power.

• PoE Delivered Power Budget

  Estimate delivered PoE power as source power minus I²R cable loss and other fixed losses. Use the full loop resistance of the powered conductor pairs; protocol class and startup margins are not modeled.